What are the signs your baby has acid reflux? My baby is almost 2 weeks old. We have been struggling to breast feed the entire time. My milk was delayed coming in. She has trouble latching so we use a nipple shield. She's done pretty well with it until the past 24 hours. She refuses to latch. She cries when I give her pumped breastmilk. She almost always spits up after having breastmilk. Formula seems to be the only thing to calm her down and fill her up. I really want to breastfeed but I'm getting so discouraged.